The set contains 4 different trimmers and is utilized mainly for adjustments in the Laboratory. All 4 burs / cutters are generally used to trim acrylics of functional appliances, and in the case of the jumbo acrylic cutter to trim the bulk stone off working and study models. The two grey medium - grit polishers are used for rough finish on acrylic repairs and the yellow fine - grit polishers for high - shine. The polishing wheel and mandrel are primarily used to polish wires and bands that have been soldered. 4007HP 0662HP 5760.045HP 0664HP 5455.060HP 5410.060HP 0110.023HP 0654HP 0501UM